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通过8个箍筋约束纤维增强混凝土(FRC)棱柱体轴心受压试验,研究了箍筋约束作用对FRC轴压承载力的影响。结果表明:箍筋配箍率较高、箍筋间距较小、形式较合理的约束FRC试件,具有较好的约束效果,其轴心受压应力-应变曲线的下降段也较为平缓,箍筋在配箍率较高、试件达到最大荷载时才会屈服。基于试验数据和理论分析,提出了约束FRC的峰值应力及其对应应变的计算式,给出了箍筋约束FRC的应力-应变本构方程。峰值应力及其对应应变的计算值与试验值,理论曲线与试验曲线均吻合较好。
The influence of restraining action of stirrups on the bearing capacity of FRC was studied by compressing 8 FRP prismatic axial restraints. The results show that the stirrup ratio of stirrup is higher and the stirrup spacing is smaller. The restrained FRC specimen with more reasonable form has a better restraining effect, and the axial compressive stress-strain curve also has a more gentle descending stage. Ribs in the higher rate of the stirrup, the specimen reached its maximum load will yield. Based on the experimental data and theoretical analysis, the formulas for calculating the peak stress and the corresponding strain of confined FRC are proposed, and the stress-strain constitutive equations of the confinement FRC are given. The calculated values of peak stress and its corresponding strain agree well with the experimental values, theoretical curves and experimental curves.